html, body {
    width: 100%;
    height: 100%; 
    margin: 0; 
    padding: 0; 
    overflow: hidden;
    background-color: black;
    color: wheat;
}
body{
    background:url("../img/page/login/login.jpg") no-repeat;
    background-size:100% 100%;
}
.col-center-block {  
    float: none;  
    display: block;  
    margin-left: auto;  
    margin-right: auto;  
} 
.main_title{
    font-family:verdana;
    font-weight: bolder;
    margin-left: 2%;
    margin-bottom: 5%;
}